Reciprocating engine.



No. 642,76l. Patented Feb. 6, I900. M. H. SMITH.

RECIPRUCATINH ENGINE.

(Application filed June 29, 1897.)

(N0 Model.)

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Nrrnn STATES ATENT FFICE.

RECIPROCATING ENGINE.

SPECIFICATION forming part of Letters Patent No. 642,761, dated February6, 1900. Application filed June 29, 1897. $erial No. 642,890. (Nomodel.)

To aZZ whom it may concern.-

Be it known that I, .MIOHAEL HOLROYD SMITH, a subject of the Queen ofGreat Britain and Ireland, and a resident of Albany Buildings, 47Victoria street, Westminster, London, in the county of Middlesex,England, have invented a certain new and useful Improved Means forLessening Vibration in Reciprocating Engines and Machines, of which thefollowing is a specification.

The object of my invention is to lessen the vibration of reciprocatingengines by providing novel mechanism for balancing the operative parts.In order to accomplish this object, I divide the power-shaft and mountupon the contiguous extremities thereon a pair of counterbalanced cranksoperatively connected, respectively, with the piston by means of a pairof oppositely-disposed bell-crank levers coaxially. fulcrumed within thepiston and connected for correlative movement by a pair ofconnecting-rods pivoted to the short arms of the levers and to a guidecommon to both and designed to compel identical movement thereof.

Referring to the drawings, Figure l is a sectional elevation of mydevice applied as in use; and Fig. 2 is a similar View, the sectionbeing taken at right angles to that shown in Fig. 1.

Referring to the letters of reference, indicating corresponding parts inthe several views,A A indicate a pair of counter-weighted cranks keyedor otherwise secured upon the contiguous extremities of the shafts orshaftsections, mounted in suitable bearings, as usual.

B B indicate the long arms or connectingrods of a pair of bell-cranklevers having coaxial fulcrums upon the interior of a hollow piston Cand from the oppositely-disposed short arms 70 7a of which extend towardthe open end of the piston a pair of links or connecting-arms L L,pivoted at their lower ends to the opposite sides of a guide-sleeve M,longitudinally movable upon the guide-pin N, extending coaxially intothe piston from a supporting-bracket 0. It will now be obvious that thereciprocation of the piston will cause the counterweighted cranks A A torevolve in opposite directions and that the thrust of each lever, whichwould otherwise A cause Vibration, will be counteracted by itscounterweight and the opposing thrust exerted upon the other crank.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a reciprocating engine, the cylinder, the piston, the two shafts, thetwo cranks connected therewith, two counterweights connected with thecranks, and two connectingrods provided with bell'cranks at their upperends, combined with suitable connecting-rods for each of thebell-cranks, a sleeve to which the lower ends of the connecting-rods arepivoted, a guide-pin, and a suitable support therefor, the bell-cranksbeing pivoted inside of the hollow piston, substantially as shown anddescribed.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

MICHAEL HOLROYD SMITH.

Witnesses:

REGINALD WALTER BARKER, CHAS. Roonn.

